Clamping device



May 29, 1923. 1,457,150

M. J. DE GRAVE GLAMPING I DEVICE Filed Feb. 11, 1922 ,5? 7 Mel iz gva e Patented May 29, 1923.

m g M CHAEL; n12 ILLIN S:

To all whom. it may) cQflCm} State of Illinois, have invented certain new and useful Improvements in a Clamping Device, of which the following specification.

My invention relates to clamping devices, and hasfor its principal object the provision of an improved construction of this character which will be highly eflicient in use.

A further object of the invention is the provision of a clamping device especially designed for clamping together stretching members of a curtain stretcher frame and by the application of which will greatly facilitate the mounting together of the various" members of the frame and disassembling the same. Other objects will appear hereinafter. The invention consists in the combination and arrangements of parts hereinafter described and claimed.

The invention will be best understood by reference to the accompanying drawings forming a part of this specification, and in which,

Fig. l is a side elevational view of'a clamping device embodying the invention Fig. 2 is a sectional detail view, of the same, taken substantially on line 2-2 of Fig. 3, and Fig. 3 is a plan view, of the same. Referring to the drawings 5 and 6- indicate a pair of curtain stretching members, of any approved type, havingcurtain pin grooves 7 and arranged substantiall at right angles with respect to each other. The member 5, as shown, is arranged and adapted to move longitudinally with respect to the member 6 and is clampingly held in operative engagement with the member 6 by means of a clamp A embodying the invention.

The clamping member A comprises ant e bre-u h whi h the. "b l s? pass, :istja;

r tteiievl r y? sh ped" slot; 1'0. at h p s g of the ases-ins. cad w'f jle er' by v t e damn n nd o he P ate??? s; forced into clamping engagement-with the s shown. Opposi sfl h of hellimbpor. eitknownthat ILMIQWE .-.D GRAY I a citizen ofthe UnitedSt at1 es, -and'a resident of the city of- Chicago,-county-ofCook, and

memb T 'en as nelend, goftheleven 11' is bent, a trifle beyonda right angle with respect to the lever providing a/foot 12 which, when the lever'is moved into clamp ing position to effect a clamping relation between the members 5 and 6 the foot 12 serves to limit the operative movement of the lever. Carried by the lever 11 and. forming a part thereof, are trunnions 13 which engage triangularly shaped recesses 14: formed byfieX .ing outwardly the portions ofsaid limb on the opposite sides ofsaid slot in'limb portlon 0 of the plate 8, as shown;

To prevent the engaging'end ofgthe lever 11 from wearing or working on'the adjacent surface of the memberb, Iprovide a metalthe member 5. 'As, most curtain stretching .lic bearing plate 15 interposed between the]. limb portions 0 and the adjacent-surface of members are formed of soft wood such as" I pine, the metallic bearing plate 15' prevents the engaging end of the lever 11 from digging into the member 5 which in the course of time would render the clamping device useless.

The operation of the clamping device, as I will be readily understood by referring to the description herein and the drawings, is of such a simple nature that one is en-. abled to secure the curtain stretching members together and dismount the" same in a short time. The clamping device will also 'prove'to be of great value owing to its simplicity in structure and the firmclamping engagement eflected between the adjacent curtain stretching members.

, lVhileI have illustrated and described the preferredform of construction for carrying my invention into effect, this 'is capable of variation and modification without depart: ing from the spirit of the invention} I,

therefore, do not wish to, be limited to the precise details of the construction set forth,

but desire to avail myself of such variations and modifications as come within the scope of the appended claims. 1

Having described my invention, what I claim as new and desire to secure by Letters Patent is: p

1. In a clamping device comprising in combination with a pair of curtain stretch ing members arranged substantially at right angles with respect to each other and a clamping plate of an openingt'ormed in the body of said plate, there being outwardly flexed portions of said plate at opposite sides of said opening; end passing through said opening, for engagement with the adjacent stretching member whereby said stretching members are clamped together by movement of the lever inone direction, said lever being trunnions on said lever adapted to engage recesses formed by the flexed portions of said 15 plate.

.QLIn'aclamping device comprising in and a lever having one combination with an L-shaped clamping plate adapted to embrace adjacent curtain stretching members, and having an opening formed invthe body thereof and outwardly flexed portions on opposite sides of said opening, of an operating lever passing through said opening and having trunnions engagmg recesses formed by the flexed portions of said p ate.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses. MICHAEL J. DE GRAVE. Witnesses:

JOSHUA" R. H. Porrs, FREDA C. APrLn'roN. 

